270 



[Vol. 9 



GARDEN 



Nelson & Nelson 6663 (Rky. Mt. Herb, and Mo. Bot. Gard. 

 Herb., type); Jackson's Hole on Snake River, June 15, 1860, 

 Hayden (Mo. Bot. Gard. Herb.); Bacon Creek, Uinta County, 

 Aug. 15, 1894, Nelson 922 (Mo. Bot. Gard. Herb, and Rky. Mt. 

 Herb. ) . 



Washington: 1889, Vasey 194 (U. S. Nat. Herb.). 



Much of the confusion and the involved synonymy that has 

 obtained in regard to this species has been due to the effort to 

 maintain Streptanthus sagittatus and P achy podium sagittatum 

 of Nuttall as distinct. It is altogether possible that Nuttall him- 

 self may not have regarded them as different and the confusion 

 may have arisen because of a change in Nuttall's opinion as to 

 the genus to which the species should be referred. The type of 

 S. sagittatus was collected by Wyeth in 18:53 on the "Little God- 

 din River" and of P. sagittatum presumably by Nuttall on 



f the Roc] 



The 



types are so fragmentary and immature as to make identification 

 doubtful. 



After a study of a considerable series of specimens it was 

 found impossible to maintain as distinct the various segregates of 

 this species recently proposed. Only two forms seem to stand out 

 as separable — a southern one with slender pods and a northern 

 one with thick pods. When mature these plants are easily sepa- 

 rated and no intermediates have been seen; their ranges also 

 seem to be constantly distinct. With the species thus limited 

 the question arose as to the exact location from which the type 

 specimens were secured. Nuttall on his trip to Oregon with 

 Wyeth in 1834 followed the famous "Oregon Trail" and from 

 the journal kept by Dr. Townsend, another member of the party, 

 it seems certain that nowhere did they go far enough north to 

 encounter the variety with thick pods. If the type of Pachy- 

 podium sagittatum was collected it was evidently the typical 



form 



has also been carefully 



order to learn the exact location of the "Little Goddin River" 

 with the result that this has been identified with the "Little 

 Lost River" of southern Idaho. To any one familiar with the 

 topography of this region it is easy to follow the references to 

 familiar landmarks and so locate without doubt the places that 

 were visited. The form of the species that occurs in southern 

 Idaho is also that which is here considered typical. Consequently 

 these two names which have been maintained with so much diffi- 



